While I believe, that even a 4 day week and earlier retirement is possible, that was not the premise in our discussion. The premise was, that one could reduce work time. And if you can do a 4 day week, you could also do a 5-day week and retire earlier. After all, the output produced during your lifetime would be the same. So, if one is possible, the other is as well.
I think you are confusing work output with working time.
If we look only at what you produced during your working life then you are right, we can probably retire earlier having already produced our share of "something".
The problem is that what we put aside is not proportional to the output (rightly) but to the time we work so if we retire earlier we miss some time during which we built our retirement fund (whatever it is) while expecting to live longer at the same time.
And while this can work in small numbers, it not work if you extend to the whole society.
The society has means to supply them at a basic level of sussistence, no more
Even more. Do you think Amazon would run out of flatscreens in our hypothetical scenario? I doubt it. Probably not everybody could receive a 70 ft Yacht, but the vast majority could not afford that nowadays or if they worked, idk, three years longer ¯(ツ)/¯. We could easily sustain the hypouhetical retirees life standard, ez.
No, but who pay for them ?
Tax the rich ? Right. Let's make an example: if we consider to tax the rich for 10.000.000.000 euros/year this means that every retired in Italy (about 23.000.000) get about 435 euro/year.
Even if the number of retirees whose pensions need to be supplemented were halved we just get a little less of 1000 euro/year. Too less to have any significance.
I think you should find the money some other ways.
That was the main contributing factor, though. It is easier, when the country is in ruins and everybody is piss poor. But after the recent years we approach the latter once again. But with what the redistribution helps: money is spend fast. That is important for the economy to flourish and everybody profiting from it.
I don't see how we are approaching a similar scenario, if nothing else because we are not a pile of rubble again (hopefully).
Then production is expanded, workers are paid more. As a government you have to make the money flow around.
Except production is no more here, so you cannot pay the worker more as there are no (well, less) workers.
Easiest way to achieve that? Be Robin Hood and give to the poor. They will spend the money.
For the first or second year, then the rich would have nothing more or, more probable, moved their money out of your reach and you will be left with nothing.